Habit Restaurants Inc. in Irvine was down 4.6% to $16.60 and a $416 million market cap on high volume. The fast-casual burger chain’s shares had traded at a rate more than twice its 90-day average by midday. Its shares have declined about 8% this week.

RETAIL

Boot Barn Holdings Inc. (NYSE: BOOT) was up 7% to $6.58 and a $172 million market cap on high volume. The company, which runs a chain of western wear stores, had traded shares at a rate 50% above its 90-day average volume by midday.

HEALTHCARE

Aeolus Pharmaceuticals Inc. (OTC: AOLS) in Mission Viejo was up 51% to 11 cents a share and a $17 million market cap. It develops products to prevent fibrosis, inflammation, nerve damage and infection. The company said a development-stage product aimed at preventing tissue damage from radiation, toxic chemicals and disease or trauma had been given “fast-track” designation by the Food and Drug Administration that could expedite its review.